Mapping multipule textures to one object in blender
If you're going to use this in a mobile game, then it's best to place all the floor images onto a single texture.  UV unwrap the floor onto a single image and only have one texture (with the 3 different floor images on the single texture).  

This way the game engine will only need to bind and sample a single texure (instead of 3) just to draw a simple floor.  I'm thinking of optimisation here, and if you can fit the 3 images onto a single texture, then that is the best way to go.